<template>
  <div class="app-container">
    <h2 style="text-align: center">发布新课程</h2>

    <el-steps
      :active="1"
      process-status="wait"
      align-center
      style="margin-bottom: 40px"
    >
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" />
      <el-step title="提交审核" />
    </el-steps>

    <el-form label-width="120px">
      <el-form-item label="课程标题">
        <el-input
          v-model="courseInfo.title"
          placeholder=" 示例：机器学习项目课：从基础到搭建项目视频课程。专业名称注意大小写"
        />
      </el-form-item>

      <!-- 所属分类 TODO -->

      <!-- 所属分类：级联下拉列表 -->
      <!-- 一级分类 -->
      <el-form-item label="课程类别">
        <el-select
          v-model="courseInfo.subjectParentId"
          placeholder="请选择"
          @change="subjectLevelOneChanged"
        >
          <el-option
            v-for="subject in subjectOneList"
            :key="subject.id"
            :label="subject.title"
            :value="subject.id"
          />
        </el-select>
        <!-- 二级分类 -->
        <el-select v-model="courseInfo.subjectId" placeholder="请选择">
          <el-option
            v-for="subject in subjectTwoList"
            :key="subject.value"
            :label="subject.title"
            :value="subject.id"
          />
        </el-select>
      </el-form-item>

      <!-- 课程讲师 TODO -->
      <!-- 课程讲师 -->
      <el-form-item label="课程讲师">
        <el-select v-model="courseInfo.teacherId" placeholder="请选择">
          <el-option
            v-for="teacher in teacherList"
            :key="teacher.id"
            :label="teacher.name"
            :value="teacher.id"
          />
        </el-select>
      </el-form-item>

      <el-form-item label="总课时">
        <el-input-number
          :min="0"
          v-model="courseInfo.lessonNum"
          controls-position="right"
          placeholder="请填写课程的总课时数"
        />
      </el-form-item>

      <!-- 课程简介 TODO -->
      <!-- 课程简介-->
      <el-form-item label="课程简介">
        <tinymce v-model="courseInfo.description" />
      </el-form-item>

      <!-- 课程封面 TODO -->
      <!-- 课程封面-->
      <el-form-item label="课程封面">
        <el-upload
          :show-file-list="false"
          :on-success="handleSuccess"
          :before-upload="beforeAvatarUpload"
          :action="BASE_API + '/eduoss/fileoss/upload/cover'"
          class="avatar-uploader"
        >
          <img :src="courseInfo.cover" />
        </el-upload>
      </el-form-item>

      <el-form-item label="课程价格">
        <el-input-number
          :min="0"
          v-model="courseInfo.price"
          controls-position="right"
          placeholder="免费课程请设置为0元"
        />
        元
      </el-form-item>

      <el-form-item>
        <el-button
          :disabled="saveBtnDisabled"
          type="primary"
          @click="saveOrUpdate"
          >保存并下一步</el-button
        >
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
import courseApi from "@/api/edu/course/course";
import teacherApi from "@/api/edu/teacher/teacher";
import subjectApi from "@/api/edu/subject/subject";
import Tinymce from "@/components/Tinymce";
export default {
  components: { Tinymce },
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      courseInfo: {
        subjectParentId: "",
        subjectId: "",
        lessonNum: "",
        description: "",
        teacherId: "",
        id: "",
        price: "",
        cover: process.env.OSS_PATH + "/default/cover.jpg",
      },
      courseId: "",
      OSS_PATH: process.env.OSS_PATH,
      BASE_API: process.env.BASE_API,
      cover:process.env.OSS_PATH + "/default/cover.jpg",
      teacherList: [],
      subjectOneList: [],
      subjectTwoList: [],
    };
  },

  created() {
    this.init();
  },

  methods: {
    init() {
      if (this.$route.params && this.$route.params.id) {
        this.courseId = this.$route.params.id;
        this.getInfoById();
        this.getTeacherList();
        // this.getOneSubject();
        subjectApi.getAll().then((response) => {
          this.subjectOneList = response.data.items;
          
          for (var i = 0; i < this.subjectOneList.length; i++) {
            if (this.courseInfo.subjectParentId == this.subjectOneList[i].id) {
              console.log(i)
              this.subjectTwoList = this.subjectOneList[i].children;
              //console.log(this.subjectTwoList)
              break;
            }
          }
        });
      } else {
        this.getTeacherList()
        this.getOneSubject()
        this.courseInfo={cover: this.cover}
      }
    },
    getInfoById() {
      courseApi.getInfoById(this.courseId).then((response) => {
        this.courseInfo = response.data.item;
      });
    },
    beforeAvatarUpload(file) {
      const isJPG = file.type === "image/jpeg";
      const isLt2M = file.size / 1024 / 1024 < 2;

      if (!isJPG) {
        this.$message.error("上传头像图片只能是 JPG 格式!");
      }
      if (!isLt2M) {
        this.$message.error("上传头像图片大小不能超过 2MB!");
      }
      return isJPG && isLt2M;
    },
    handleSuccess(res, file) {
      console.log(res);
      this.$message({
        type: "success",
        message: "上传封面成功",
      });
      this.courseInfo.cover = res.data.url;
    },
    getTeacherList() {
      teacherApi.getAll().then((response) => {
        this.teacherList = response.data.items;
      });
    },
    getOneSubject() {
      subjectApi.getAll().then((response) => {
        this.subjectOneList = response.data.items;
      });
    },
    subjectLevelOneChanged(value) {
      for (let i = 0; i < this.subjectOneList.length; i++) {
        //
        if (value === this.subjectOneList[i].id) {
          // this.courseInfo.subjectId = "";
          if(this.courseInfo.subjectId){
            this.courseInfo.subjectId = ""
          }
          this.subjectTwoList = this.subjectOneList[i].children;
          
          break;
        }
      }
    },
    saveOrUpdate() {
      if (this.courseId) {
        this.update();
      } else {
        this.save();
      }
    },
    save() {
      courseApi.saveCourseVo(this.courseInfo).then((response) => {
        this.$message({
          type: "success",
          message: "添加基本课程信息成功",
        });
        this.courseInfo.id = response.data.id;
        this.$router.push({ path: "/course/chapter/" + response.data.id });
      });
    },
    update() {
      courseApi.updateCourseInfo(this.courseInfo).then((response) => {
        this.$message({
          type: "success",
          message: "更新基本课程信息成功",
        });
        this.courseInfo.id = response.data.id;
        this.$router.push({ path: "/course/chapter/" + response.data.id });
      });
    },
    handleAvatarSuccess(data) {},
  },
  watch:{
    $route(to, from) {
      this.init();
    },
  }
};
</script>
<style scoped>
.tinymce-container {
  line-height: 29px;
}
</style>